I was once responsible for an office network where on a semi-regular basis the entire network would collapse and become unusable. It took several days to work o

I was once responsible for an office network where on a semi-regular basis the entire network would collapse and become unusable. It took several days to work out that it collapsed when one particular user came into the office, and even longer to find that the Sonos iOS app does some STP magic which didn't cooperate with the cheap wireless router we were using.